Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
Alvin records an average high-temperature of a still tropical 86.2°F (30.1°C) in September, maintaining a close correlation with August's 90.9°F (32.7°C). Alvin, during the nights of September, experiences an average temperature drop to a warm 75°F (23.9°C).Heat index
September's mean heat index is estimated at a fiery hot 98.6°F (37°C). Incorporate special precautions, risk of heat exhaustion and heat cramps is substantial. Sustained activity could cause heatstroke.Records show heat index calculations are tailored for shaded regions and mild winds. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.
Humidity
In September, the average relative humidity in Alvin is 76%.Rainfall
September is the month with the most rainfall. Rain falls for 20.2 days and accumulates 5.94" (151mm) of precipitation.Snowfall
February through December are months without snowfall.Daylight
In September, the average length of the day in Alvin, Texas, is 12h and 20min.On the first day of the month, sunrise is at 6:58 am and sunset at 7:42 pm. On the last day of September, in Alvin, sunrise is at 7:14 am and sunset at 7:07 pm CDT.
Sunshine
In September, the average sunshine in Alvin is 8.6h.UV index
The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 6 suggests these recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot in Alvin during September?
What is the average humidity in September in Alvin?
What is the wettest month in Alvin?
How much does it rain in Alvin in September?
When it does not snow in Alvin?
How many hours of daylight does Alvin have in September?
What time are sunrise and sunset in September in Alvin?
How long on average sun shines in September in Alvin?
What is the UV index reading in September in Alvin?
Average temperature in September
Alvin, TX
- Average high temperature in September: 86.2°F
The warmest month (with the highest average high temperature) is August (90.9°F).
The month with the lowest average high temperature is January (60.8°F).
- Average low temperature in September: 75°F
The month with the highest average low temperature is August (78.6°F).
The coldest month (with the lowest average low temperature) is January (48.2°F).
Average pressure in September
Alvin, TX
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Alvin, TX
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).
Average humidity in September
Alvin, TX
- Average humidity in September: 76%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Alvin, TX
- Average rainfall in September: 5.94"
The wettest month (with the highest rainfall) is September (5.94").
The driest month (with the least rainfall) is February (1.81").
Average rainfall days in September
Alvin, TX
- Average rainfall days in September: 20.2 days
The month with the highest number of rainy days is September (20.2 days).
The month with the least rainy days is January (12.4 days).
Average snowfall in September
Alvin, TX
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.04").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Alvin, TX
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Alvin, TX
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Alvin, TX
- Average sunshine days in September: 8.3 days
The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is September (8.3 days).
Average UV index in September
Alvin, TX
- Average UV index in September: 6
The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 4).
Average cloud cover in September
Alvin, TX
- Average cloud cover in September: 31
The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Alvin, TX
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Alvin, Texas, USA
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